Chocolate
Willy Wonka is evil.
Alright, maybe you left out the "genius" part out, but right now your brain isn't capable of intellectualising. All your mind is capable of right now is receiving electrical impulses from your tastebuds, telling you that Wonka's-Scruptious Fudgemellow Delight is delicious and that your first bite must be followed by another.
You oblige.
You still rationalise that you can save the rest for later. Hoping against hope of course, because you're still 'rationalising' after your second bite. And your third. And your ever-so-small fourth one that any rational individual would tell you is your largest yet. And so the litany goes on. Right until your brain stops getting from your tongue and switches to sense of sight to find out why.
No more chocolate.
Naturally you're appalled. The wrapper promised that the taste would last, but already that sweet, wholesome feeling of chocolate is fading. Well, this won't stand, you think. Right now, in light of this outrage, there's only one thing left to do.
Buy another one.